target: consolidate existing target/algo common_magic

Unify common_magic type to unsigned int
Move common_magic to be the first member of the struct
Add unsigned specifier to xxx_COMMON_MAGIC #defines

Change-Id: If961d33232698529514ba3720e04418baf6dc6fe
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/6996
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/target/arc.h

@@ -27,7 +27,7 @@
 #include "arc_cmd.h"
 #include "arc_mem.h"
 
-#define ARC_COMMON_MAGIC	0xB32EB324  /* just a unique number */
+#define ARC_COMMON_MAGIC	0xB32EB324U  /* just a unique number */
 
 #define AUX_DEBUG_REG                   0x5
 #define AUX_PC_REG                      0x6
@@ -183,7 +183,7 @@ struct arc_actionpoint {
 };
 
 struct arc_common {
-	uint32_t common_magic;
+	unsigned int common_magic;
 
 	struct arc_jtag jtag_info;